PHP SplDoublyLinkedList::offsetGet() Method: Usage and Examples

Reads a value at the given zero-based offset without removal.

The examples focus on the operation itself, including the important distinction: offsetSet replaces a value instead of reading it.

What It Does

Use the examples below to observe the behavior on a small dataset before extending it to application code.

Syntax and Return Value

SplDoublyLinkedList::offsetGet($index)

The displayed signature describes the API or identifies any correction or optional dependency. When a parameter is optional, supply it only when the task requires it.

Parameters

• index: required.

Example 1: Basic Use

The list begins with 3 values. Notice how offsetGet changes or observes its indexed deque rather than an ordinary associative array.

<?php
$list = new SplDoublyLinkedList();
$list->push('tea');
$list->push('coffee');
$list->push('water');
echo json_encode($list->offsetGet(1));

Output from a successful local PHP 8.4 run:

"coffee"

Example 2: Checking Behavior

The list begins with 4 values. Notice how offsetGet changes or observes its indexed deque rather than an ordinary associative array.

<?php
$list = new SplDoublyLinkedList();
$list->push('one');
$list->push('two');
$list->push('three');
$list->push('four');
echo json_encode($list->offsetGet(1));

Output from a successful local PHP 8.4 run:

"two"

Example 3: Practical Example

The list begins with 3 values. Notice how offsetGet changes or observes its indexed deque rather than an ordinary associative array.

<?php
$list = new SplDoublyLinkedList();
$list->push(4);
$list->push(8);
$list->push(12);
echo json_encode($list->offsetGet(2));

Output from a successful local PHP 8.4 run:

12

Important Behavior and Edge Cases

An invalid index raises OutOfRangeException; check offsetExists first.

Comparison with Related Approaches

Common Beginner Mistakes

Key Takeaways

• Reads a value at the given zero-based offset without removal.
• An invalid index raises OutOfRangeException; check offsetExists first.
• offsetSet replaces a value instead of reading it.

Use SplDoublyLinkedList::offsetGet when its documented behavior matches the problem. Test the relevant edge cases in your own runtime before deploying it.